# https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree


class TreeNode:
    def __init__(self, x):
        self.val = x
        self.left = None
        self.right = None


class Solution:
    def sortedArrayToBST(self, nums):
        """
        从一个sorted list，得到BST，
        https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/description/
        :type nums: List[int]
        :rtype: TreeNode
        """
        if not nums:
            return None
        mid = len(nums) // 2
        root = TreeNode(nums[mid])
        root.left = self.sortedArrayToBST(nums[:mid])
        root.right = self.sortedArrayToBST(nums[mid + 1:])
        return root
